Everyone in the whole world can read the blog and anyone with a RSS reader can receive the posts but if you want to receive them directly to your e-mail then you can join the group and all the posts will arrive. You will also be able to send messages to the other members of the group. For example, if you wanted to get a friendly recommendation for a lawyer in Australia you could ask the group.
This is the reason I wanted to make the group closed so that you would know that if you sent such a message it would go to like-minded Solo practitioners or sympathetic real IP professionals. We all have to cope with a lot of spam but I would prefer that the group wasn't responsible for generating any more. Therefore, if you are trying to join the group, there is apoint where you will see a free text box. The idea is that you spend a few minutes to me that indicates you are seriously interested in IP. It easy for those of you who are and surprisingly difficult for those just looking to harvest e-mail addresses.